Energy Losses in Transformer & Q-Factor Explained | Class 12 Physics

In this lecture (Alternating Current – Lecture 12), we cover the final theoretical concepts of the chapter according to the NCERT Class 12 Physics syllabus. Learn about the working utility of transformers in long-distance power transmission, all types of energy losses in a transformer (and how to minimize them), along with Quality Factor (Q-Factor), sharpness of resonance, and bandwidth. ⏱️ Timestamps / Chapter Markers: 00:00 – Introduction & Overview (AC Lecture 12) 01:32 – Utility of Transformers (Power Transmission & Step-up/Step-down) 06:06 – Energy Losses in a Transformer (Overview) 06:33 – 1. Flux Leakage (Causes & Remedies) 08:29 – 2. Resistance of Windings / Copper Loss ($I^2R$) 10:35 – 3. Eddy Current Loss & Laminated Cores 13:08 – 4. Hysteresis Loss & Core Materials 15:44 – Sharpness of Resonance & Q-Factor (Quality Factor) 20:08 – Bandwidth & Resonant Frequency Relationship 21:27 – Summary & Upcoming Numericals Session 📚 Topics Covered: Why high-voltage transmission is preferred for minimal power loss Transformer losses: Flux leakage, Joule heating/copper loss, Eddy currents, Hysteresis Derivation and formula for Quality Factor ($Q = \frac{\omega_r L}{R}$) Concept of bandwidth and resonant sharpness for Board & Competitive exams (CBSE, JEE, NEET) 🏷️ Hashtags: #Class12Physics #AlternatingCurrent #TransformerLosses #QFactor #PhysicsClass12 #CBSEBoardExam #NCERTPhysics #ApexStudyCentre